This photo has been around for ages, and still makes me laugh and then feel sad at the absurdity that anyone could ever take it seriously.
... A closer look makes it clear to me that 'the landing legs' are in fact the fastening bolts of some kind of pipe cap. [or something similar]
This for instance is the cap from a boat's ventilation fan .. not exact,... but similar enough for illustration.
... btw... the interesting factor and only minor puzzlement to me about this tomfoolery of a claim is that going by the fact that Maslin Beach was Australia's first nudist beach.... which pocket did the witness whip out his camera from to snap this little devil when it came shooting up from the sea?????
Cheers.